Driving mechanism

Abstract

A driving mechanism for driving an optical element is provided, including a fixed part, a movable part, a bobbin, and a driving assembly. The movable part is movably connected to the fixed part and holds the optical element. The bobbin is disposed on the fixed part or the movable part. The driving assembly drives the movable part to move relative to the fixed part and has a coil disposed on the bobbin. The fixed part has a main body, and the main body forms a recess for receiving the bobbin.

What is claimed is: 
     
         1 . A driving mechanism for driving an optical element to move, comprising:
 a fixed part;   a movable part, movably connected to the fixed part and holding the optical element;   a bobbin, disposed on the fixed part or the movable part; and   a driving assembly, driving the movable part to move relative to the fixed part and having a coil disposed on the bobbin.   
     
     
         2 . The driving mechanism as claimed in  claim 1 , wherein the fixed part has a main body, and the main body forms a recess for receiving the bobbin. 
     
     
         3 . The driving mechanism as claimed in  claim 2 , further comprising a circuit unit, wherein the main body is located between the coil and the circuit unit. 
     
     
         4 . The driving mechanism as claimed in  claim 2 , wherein the main body further forms an opening, and the coil is offset relative to the center of the opening. 
     
     
         5 . The driving mechanism as claimed in  claim 2 , wherein the driving assembly has a plurality of magnets and coils, the magnets are disposed on the movable part, and the coils are disposed on the main body and the bobbin. 
     
     
         6 . The driving mechanism as claimed in  claim 5 , wherein the coils include a first coil and a second coil, the main body further forms a plurality of first protrusions, and the bobbin forms a plurality of second protrusions, wherein the first coil is wound around the first protrusions, and the second coil is wound around the second protrusions. 
     
     
         7 . The driving mechanism as claimed in  claim 6 , wherein the second protrusions have different sizes. 
     
     
         8 . The driving mechanism as claimed in  claim 7 , wherein the main body further forms a first curved surface, and the bobbin further forms a second curved surface connected to the first curved surface when the bobbin is joined in the recess. 
     
     
         9 . The driving mechanism as claimed in  claim 8 , wherein the main body forms two second protrusions, and one of the second protrusions is closer to the second curved surface and larger than the other second protrusion. 
     
     
         10 . The driving mechanism as claimed in  claim 8 , wherein the second coils protrude from the second curved surface. 
     
     
         11 . The driving mechanism as claimed in  claim 6 , wherein the main body further forms two first protruding portions, and the bobbin further forms two second protruding portions, wherein the ends of the first coil are wounded around the first protruding portions, and the ends of the second coil are wounded around the second protruding portions, wherein the first protruding portions have a first distance, the second protruding portions have a second distance, and the first distance is greater than the second distance. 
     
     
         12 . The driving mechanism as claimed in  claim 2 , further comprising a circuit unit, wherein the main body is located between the coil and the circuit unit, the bobbin forms a hole, and the circuit unit has a substrate and a position sensor disposed on the substrate, wherein the position sensor is received in the hole.